It's supposed to say:
'Lead us from war to peace; peace fill our hearts, let peace fill our world, let peace fill our universe.' (from the Peace Prayer)
But since this looks like a Google translation, I'd check with a Welsh speaker.
ayrglith arwann trooyr anialooch
Tolkien is subtly vague here, but the implication is that Tom Bombadil is one of the Maiar, a sort of lower-level "angel" if you will, as opposed to the Valar, who are relatively equivalent to the various gods of mythology. When they appear in Middle-Earth at all, the Maiar are generally portayed as humanoid, but endowed with powers and understanding far greater than mortals or elves. Other Maia include Sauron the Dark Lord and the wizards Gandalf (Olorin is his Maia name), Saruman the White, and Rhadagast the Brown. Tom Bombadil's Maia name is Arwain Ben-adar, which means "oldest and fatherless." His powers are very powerful but centered about his home, which is close to the Withywindle River.